Tom Service talks to conductor Paavo Jarvi ahead of his appearance at this year's Proms with the Estonian Festival Orchestra. Also, environmentally sensitive American composer John Luther Adams and British composer Tansy Davies talking about the relationship between sound and nature in their pieces - all to coincide with the BBC Forest season. And we take a look at how important is timber to the acoustics of the symphonic concert hall, connecting the contribution of nature to music - architect Richard Battye, with experience in the construction of such venues uncovers a surprising truth. Show less